Journal of the Optical Society of Korea

Optical Society of Korea (한국광학회)
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Effect of Modification of SeO2/Acrylamide Ratios on Diffraction Efficiencies in PVA/AA Photopolymer Films

  • Kim, Dae-Heum (Chemical Engineering Department, Kwangwoon University) ;
  • Lim, Ji-Yun (Chemical Engineering Department, Kwangwoon University) ;
  • Nam, Seung-Woong (Chemical Engineering Department, Kwangwoon University) ;
  • Chung, Dae-Won (Polymer Engineering Department, Suwon University)
  • Received : 2007.09.07
  • Published : 2007.12.25
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Abstract

The highest diffraction efficiency(DE) value after illumination and post-curing of photopolymer films were obtained at the $SeO_2$/Acrylamide(AA) Ratios of AA 3.0 g, $SeO_2$ 1.0g and the DE's were stable values of over 90%. By the addition of $SeO_2$, the maximum DE at the initial stage of illumination was reached at 300 seconds, which suggests $SeO_2$ slows down the photopolymerization of AA, which enhances the maximum DE value by giving more migration time. DE variation curve for the optimum composition during extended-time illumination of 9,000 seconds resembles a sine curve due to the combination of the monomer diffusion and the photopolymerization, and the photopolymer film expanded by about 8% after photopolymerization due to monomer migration.

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References

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